这里需要(yào )说明的是,在我们系统里面如果单独设置(zhì )一(yī )个(gè )子域名(míng )解(jiě )析,比(bǐ )如将主机名设(shè )置为mail,单(dān )独解析(xī )到(dào )9,那么(me )该解(jiě )析记录(lù )优(yōu )先泛域(yù )名在实际(jì )使用中(zhōng )作(zuò )用(yòng )是(shì )非(fēi )常(cháng )广(guǎng )泛(fàn )的,比(bǐ )如实现无限二级域名(míng )功能,提供免费的url转发,在
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